cam grinds for SC

[Gary Derian]

To my mind, roots type or centrifugal type superchargers would both benefit
from small overlap cams.  This is because these are the only engines that
have greater intake pressure than exhaust pressure.  Too much overlap just
blows intake out the exhaust.

Gary Derian <gderian at oh.verio.com>
>
> I'm about to install a Vortech supercharger on my SBC 305 TPI, and
> I'm thinking about changing cams too. The vortech FAQ has
> this to say about cams:
>
> 4) What is the correct cam to run with my
>    supercharger?
>
>        Cam selections are best discussed with the various
>        cam manufacturers. Many people select cams which
>        are not the correct choice for centrifugal
>        superchargers. When discussing the cam with a
>        manufacturer make sure they understand a Turbo cam
>        or a cam for a Roots style supercharger is different
>        than a centrifugal cam. Generally speaking the
>        supercharger and the cam do the same thing (increase
>        volumetric efficiency), be cautious of choosing a cam
>        that has large amounts of lift and duration. Ideally for
>        a street application retaining decent idle, emissions
>        and drivability are important, for this reason we
>        suggest a "moderate" camshaft. Given the choice
>        between two cams we suggest the milder of the two for
>        street applications.
>
> Of course that is of little help, and I would like some idea of what's
> going on before contacting manufactures. So, what does make for a good
> cam for applications like this? How do these cams differ from turbo or
> roots specific cams?
>
> john